低渗透和裂缝性油气藏的定方位射孔完井技术

ORIENTED PERFORATING COMPLETION TECHNIQUE FOR LOW-PERMEABILITY AND/OR FRACTURED POOLS

潘迎德 张开洪 陈一健

Pan Yingde Zhang Kaihong Chen YiJian

西南石油学院完井中心

裂缝是低渗透油气藏和裂缝性油气藏的主要渗流通道及有效储集空间。油气井有无产能、产能高低及投产措施的有效性在很大程度上取决于射孔孔眼能否直接沟通天然裂缝系统,而孔眼与裂缝面的夹角、射孔弹穿透深度是两个最主要的射孔工艺参数。在扎眼垂直于天然裂缝面或最小水平主应力条件下,孔眼穿透越深,孔眼产量越高。定方位射孔完井技术是提高低渗透油气藏和裂缝性油气藏勘探开发效工的一项新技术措施。射孔完井前,通过定方位优化射孔软件优选射孔参数,然后根据定方位射孔井下仪与地面计算机系统确定射孔枪位置及射孔方位,使之垂直于裂缝面或最小水平主应力实施射孔,将大大提高油气井的产能。

Fractures are main flowing channel and effective storage space of low-permeability and/or fractured pools. The productivity and treatment effectiveness of oil/gas well depend on whether or not the perforating tunnels interconnect with natural fractures.The angle between perforating tunnel and fracture plane and the perforation length are main technological parameters. When the per forating tunnel is perpendicular to fracture plane or minimum horizontal major stress, the longer the per foration length, the higher the production of perforation. Therefore, the oriented perforating completion is a new technology for improving the development benefits of the said reservoirs. After the perforating parameters are optimized by the computer software for oriented per foration design, the downhole instruments and surface computer system for oriented perforating are used for determining the position of perforating gun and the orientation of perforation, which makes the perforating tunnel is perpendicular to fracture plane or minimum horizontal major stress, and increasing greatly the productivity of oil/gas well.

10.3969/j.issn.1000-7393.1997.05.014